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The N‐heterocyclic carbene‐catalyzed reaction of alkynyl aldehydes with 1,3‐keto esters or 1,3‐diketones has been studied. This protocol offers an entirely new, mild and atom‐economical access to highly functionalized 3,4‐dihydropyranones.
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Zhu et al. (2010) studied this question.
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